Automatic sawmill set works



May 9, 1961 J. H. THEDICK AUTOMATIC SAWMILL SET WORKS 8 Sheets-Sheet 1Filed Feb. 19, 1958 INVENTOR.

JOHN H. THED/CA BY M '9 W ATTORNEYS AUTOMATIC SAWMILL SET WORKS FiledFeb. 19, 1958 8 SheetsSheet 2 69 68 o K l I o 67 66 o 57 66 o OINVENTOR.

J0///V H THED/CK BY A TTO/P/VEVS y 9, 1961 J. H. THEDICK 2,983,290

AUTOMATIC SAWMILL SET WORKS Filed Feb. 19, 1958 8 Sheets-Sheet 3 v idATTORNEYS May 9, 1961 J. H. THEDICK AUTOMATIC SAWMILL SET WORKS 8Sheets-Sheet 4 Filed Feb. 19, 1958 INVENTOR.

JOAW H. THEO/CA A T TOPNEVS May 9, 1961 J. H. THEDICK AUTOMATIC SAWMILLSET WORKS 8 Sheets-Sheet 5 Filed Feb. 19, 1958 A T TO/PNE rs May 9, 1961J. H. THEDICK AUTOMATIC SAWMILL SET WORKS 8 Sheets-Sheet 6 Filed Feb.19, 1958 INVENTOR.

JOHN H. THED/CK A 7' TORNEVS y '9, 1961 J. H. THEDICK 2,983,290

AUTOMATIC SAWMILL SET womgs Filed Feb. 19, 1958 8 Sheets-Sheet 7INVENTOR.

JO/M H. fl/ED/CK A T TOPNEVS y 9, 1961 J. H. THEDICK 2,983,290

AUTOMATIC SAWMILL SET WORKS Filed Feb. 19, 1958 8 Sheets-Sheet 8INVENTOR.

J0///V H THED/CK BY United States Patent AUTOMATIC SAWMILL SET WORKSJohn H. Thedick, Klamath Falls, 0reg., assignor to Klamath Machine &Locomotive Works, Inc., Klamath Falls, Oreg., a corporation of OregonFiled Feb. 19, 1958, Ser. No. 716,063

'10 Claims. (Cl. 143-120) This invention relates to a set works controlsystem of the automatic type for the control of the lateral movement ofthe knees of a sawmill carriage, and more particularly to a fullyautomatic set works control system which is operative to positively stopand lock the set shaft precisely at the point when the carriage kneeshave reached their desired points of adjustment.

It has been conventional in the past in the sawmill industry for two mento be employed for the operation of a given sawmill carriage. One, thesawyer, handles the loading of the carriage and controls the travel ofthe carriage. The other, the setter, sets the carriage knees andcontrols the operation of the dogs. At the present time, it isundesirable, at least in connection with some types of sawingoperations, to employ two 'men for one carriage, due to the high laborcosts involved. For this and other reasons, a number of types ofautomaticset works control systems have been devisedfor the purpose ofenabling the sawyer to perform not only his normal duties but those ofthe setter.

It is generally recognized that the automatic set Works control systemsheretofore devised leave something to be desired from the standpoints ofdimensional accuracy of the lumber being sawed and of maintenance.

When two-man carriage operation was in vogue, the most accurate, rugged,and the least costly manual set works used was that known as aTrout-type set works. In the recently issued patent to Oraik, No.2,707,501, the Trout-type set works (disclosed, inter alia, in patentsto Trout Nos. 793,406 and 995,205) is referred to as anachronistic inthat it looks and operates like an old-time streetcar motorman operatinghandle and shaf Nevertheless, the Trout-type set works enabled theattainment of optimum dimensional accuracy of the lumber being sawed andvery low maintenance cost.

Basically, a Trout-type set works comprises a shaft which is mounted forrotation and rotated with the set shaft, a ratchet wheel secured to theshaft to be rotated, a setting arm adapted to rotate coaxially to saidratchet wheel and provided with a grip block which can be caused toengage the ratchet Wheel at predetermined positions to the effect oflocking the setting arm in a given position relative to the ratchetwheel and a heavy post, or stop, memher to prevent any more than thedesired degree of rotation (i.e. the determinant of the set-out distancedesired) of the ratchet wheel by engaging the grip block. This positivestop action is imparted to the set shaft, with the result that there isa positive precision control over the setout distances desired.

Others who have been active in the art of providing automatic set workscontrol systems for sawmill carriages have worked along the line ofproviding electrical and electronic drive and control systems forinitiating movement of the set shaft and de-energizing said shaft, andthis has necessitated the provision of complicated braking and valvingsystems for stopping the carriage knee set shaft at any pre-determinedpoint. Insofar as I am aware, each such system has an inherentdeficiency with respect to precision of set-out capability which isdirectly reflected in the accuracy of the lumber being cut.

The subject set works control system is based upon the concept ofcombining the precision control features of Patented May 9, 1961 theTrout-type set works with automation control means adapted to replacethe human setter, thereby achieving the goal of eliminating the setterwithout creating a precision control problem.

An object of the present invention is to provide a Trouttype set workscontrol system which will be operable from a remote control panel.

Another object of this invention is to provide a Trouttype set workscontrol system which is conveniently operable by the sawyer.

Other objects and advantages will be apparent from the followingdescription when taken in conjunction with the accompanying drawings, inwhich:

Figure 1 is a view in side elevation, with parts broken away, of the setworks control column and related control means;

Figure 2 is a sectional view taken along lines 2-2 of Figure 1;

Figure 3 shows the upper plate of the set works control column and thecontrol elements disposed thereon;

Figure 4 is a partial view in vertical section of the apparat'us ofFigure 1;

Figure 5 shows a detail of Figure 4 in a difierent operative position;

Figure 6 is a detail view taken along lines 6 6 of Figure 4;

Figure 7 is a semi-schematic layout of the subject con trol system andthe circuitry therefor;

Figure 8 constitutes a wiring diagram for the set works column;

Figure 9 is a wiring diagram for the relay panel; and

Figure 10 is a wiring diagram for the control panel.

With reference to the drawings in detail, and with immediate referenceto Figure 1, drive shaft 10, actuated by an independent air motor (notshown) transmits its rotary movement by means of terminal bevel pinion12 to face gear 14 and set shaft 16 connected thereto. Face gear 14, inturn, transmits its movement to pinion 18 and shaft 20 connected to saidpinion. Gear box 22 supports a complex casing indicated generally at 24and said casing serves to support the immediate control elements of theset works column phase of the control system. Ratchet wheel 26 issecured to shaft 20 by a key 27 (Figure 4).

Setting arm assembly 28 comprises a forked setting arm 30 adapted toshaft 20 for independent pivotal movement relative thereto by means (seeFigure 4) comprising hub portions 32 and 34. The upper and lower forksof setting arm 30 have integral therewith outer side webs 35 whichenclose a grip block 36, the latter being pivotally supported betweensaid webs 35 by means comprising pins 38, 40, 42 and 44, link 39interconnecting pins 38 and 4t), and latch arm 43 interconnecting pins42 and 44.

Grip block air cylinder 46 is fixedly secured to setting arm hub portion34 and rotates therewith. Energization of said cylinder to move pistonrod 47 outwardly causes toothed grip block 36 to engage toothed wheel 26(see Figure 6) by means of link 48 pivotally connected to the piston rod47 and to latch arm 43, the latter being pivotally mounted on pin 42.Conjoint swinging movement of arm 43 about pin 42 and of link 39 aboutpin 38 causes grip block 36 to be moved from its Figure 4 position tothe ratchet wheel engaging position of Figure 5. Said latch arm 43further comprises a latch element 52 aflixed to its lower part, thepurpose of which will be subsequently related. Hub 34 further supportsfriction wheel 54 in fixed relation therewith, whereby two way indexingrotary movement can be parted to the setting arm assembly 28.

Housing 24 supports a set-up ring 56 (Figures 1 and 2) in fixed relationtherewith and comprises a post 58 which has pivotally mounted thereinholding pawl 60, said pawl being adapted, as hereinafter described, tobe moved into and out of holding engagement with ratchet wheel 26. Post58 also supports for axial movement a spring loaded cushion plunger 62.Fixedly supported by post 58 is top plate 64 which in turn supportsvarious drive and control elements, hereinafter described. Setup ring 56is provided with an arcuate slot 57 to permit a plurality of latchblocks 66 to be afiixed to said ring at selected positions, said latchblocks being secured to said ring and being attached to indexing, orlimit, switches 68 by means comprising bolts 70 and switch carrierplates 72. The latch blocks 66 are provided with centrally disposed slotguideways 67 having divergent ends whereby latch element 52 is centeredand guided as it moves therethrough as the grip block 36 is moved intoand out of engagement with respect to ratchet wheel 26. The indexing, orlimit, switches 68 are provided with pivotally movable control arms 69.Secured to setting arm 30 is a switch arm actuator 71 adapted uponindexing movement of said setting arm to cam said control arms 69 out ofthe path of movement of said actuator and thereby control the conditionof said switches 68.

, Means for rotating the setting arm assembly 28 in either direction ofrotation comprise the aforementioned friction wheel 54, a drive roller45- therefor secured for rotation on the output shaft 47 of reversibleindexing motor 49, the latter being mounted on a plate 50 which ispivotally supported at 51 by the top plate 64. Motor shaft 4-7 extendsthrough a slot formed in plate 64, thereby permitting motor mountingplate 50 to be swung in one direction to bring drive roller 45 intoengagement with friction wheel 54 and to be swung in the otherdirectionto disengage said roller from said wheel. Spring means (not shown)interconnecting plates 50 and 64 normally maintains roller 45 out ofengagement with wheel 54, while the piston rod of motor hinge cylinder73 mounted on plate 64 engages motor mounting plate 50 and pushes thelatter upon being energized to cause engagement of said roller with saidwheel. Cylinder 73 is under the control of an air valve 74 (Figure 3)which in turn is electrically controlled, as will hereinafter appear.

Since the principles of the Trout-type set works are well known in theart and since the present invention relates mainly to the combinationtherewith of remote control mechanism, only the latter will behereinafter described in detail.

The subject control system enables the sawyer, through the medium ofsimple controls located at his normal station and consisting of aselector, eg a tap, switch for selectively controlling the position ofthe setting arm 30 and thumb-operable controls whereby the set shaft 16may be rotated to any desired extent in either direction or may berotated to set out the knees of the sawmill carriage within theprecision control limitation reflected by a particular position of thesetting arm, to control the operation of the remotely located set workscontrol column whereby the following control movement of the set workscan be accomplished; the knees may be retracted or advanced to theextent necessary to permit loading or turning of the log on thecarriage; succeeding cuts of identical or varying thickness may be made;the setting arm will automatically index to its previously set positionafter a out has been taken in the event that it is desired to take asucceeding cut of the same thickness; and a change in either directionof the index setting can be made at any time except during the settingout operation.

The preferred embodiment of the control system shown employs an airmotor, not shown, and an air pressure system for driving the set worksand operating various of the principal control elements.

OPERATION description .will be primarily keyed to the send-schematic,

4 showing in Figure 7 of the circuitry and control elements. However,the encircled reference numbers for the leads in Figure 7 and the partsreference numbers appearing therein are set forth in the wiring diagramsof Figures 8-10 so that the details of any phase of the controloperationmay be traced.

(A) To advance and recede carriage knees at will Since this phase ofoperation is the most elemental, it will be dealt with first, as apreliminary to the more intricate aspects of the operation of thecontrol system.

By pressing either the advance button 76 or the reverse button 78, delayrelay 80 is de-energized and delay relay 82 is energized. This releasesthe holding pawl 60 from engagement with the ratchet wheel 26, the samebeing done by the introduction of a pulse into the coil of holding pawlcylinder valve 86 (Figure 3). Said valve is thereby reversed to causeholding pawl cylinder 88 (Figure 1) to move pawl 60 away from wheel 26through the linkage assembly indicated generally at 90 (see Figures 1and 8). Likewise, grip block 36 is released from the ratchet wheel 26-by a pulse introduced into the control coil of grip block cylinder valve92 (Figure 7), said valve being thereby reversed to cause .grip blockcylinder 46, through its cylinderrod, link. 48 and latch arm 43, to movethe grip block out of engagement with the ratchet wheel. Air motor valve94 is then actuated through either line or line (29, depending uponwhichof the buttons '76, 78 was pressed, to drive shaft 16. When thedepressed button of the pair 76, 78 is released, the air motor drivingof shaft 16 is stopped (valve 94 being moved to a closed position), andholding pawl 60 and grip block 35 are reengaged with ratchet wheel 26 inthat order.

The delay relay 82 allows the grip block and holding pawl to bedisengaged before the air motor drive starts, and the delay relay andthe limit switch 96 (Figure 8), the latter being actuated by movement ofthe linkage which serves to re-engage the pawl 60 with the ratchet wheel26, enable the following to be accomplished in the order mentioned: thecessation of the air motor drive; engagement of the ratchet wheel by theholding pawl; and the engagement of the ratchet wheel by the grip block.

When the holding pawl 60 is brought into engagement with the ratchetwheel and while it is in engagement therewith, the red signal light 98(Figures 7 and 10) indicates this condition, being energized throughmain Line L1, switch roe (Figures 7 and 8) and line (B) T 0 index thesetting arm With reference to Figure 10, the setting arm 30 (Figure 4)is indexed to the desired setting by turning the control knob 102 ofselector, e.g., tap, switch 104 (Figure 10) so that the switch arm 106engages the desired tap contact 108. By way of example, it will be hereassumed that the switch arm 106 is in engagement with tap #2 (Figure 8)and that it is now to be brought into engage ment with tap #4. Uponturning the control knob, relay 110 (Figures 7 and 9) is de-energized,i.e. line is disconnected from mainline L1 since tap #2 is no longerconnected thereto (it requires the connection to mainline L1 of a giventap and a closed condition of the corresponding index, or limit, switch68 in order to render line live). This causes operation of valve 92 toreverse the grip block cylinder 46, and operation of the latter causesthe latch element 52 to pass outwardly through the #2 set-up block 66(Figures 1 and 2) and releases the grip block 36 from the ratchet wheel,At the same time, the indexing motor is energized (L1, relay 110, relay112 and and drives the setting arm assembly 28 until the cam arm 71carried thereby actuates the arm 69 of the #4 indexing, or limit, switch68 to close said switch. Since the, tap switch 104 is at the #4 setting,is energized and relay 110 is thereby caused to be energized. Thisbreaks the line connection to Ed, causing the indexing motor'to stop.Energization of relay 110 allows the set-up leverlatch SZ to passthrough the #4 set-up block 66 and causes the grip block to engage theratchet wheel under the action of grip block cylinder 46. Current flowin energizes a green signal light'114 to show that indexing has 'beencompleted.

The direction of rotation of indexing motor 49 is con trolledby (seeFigure friction arm 116, contacts 118, relays 120 and Y122, and solenoid124 which returns the friction arm 116 to normal position after indexinghas been made. In the example just given where the index set 'up waschanged from the #2 to the #4 tap, contacts 118 are maintained inconnecting relation between L1 and'relay 122, and hence the motor 49 isdriven in the forward direction through one of lines 625, while a'reduced cut indexing in which the tap switch knob is rotated to a lowernumber tap causes contacts 118 to be moved out of connectingrelationbetween L1 and relay-122, with the result that the motor 49 isreversely driven through'the other of lines As previously indicated, theindexing, or limit, switches 68 and the set up blocks 66 are adjustableabout the set up ring 56 to determine the amount-of travel of the setshaft by controlling the peripheral travel of the setting arm-assembly28 and the ratchet wheel 26. The adjustment as to set-out may be madewithin limits of inch, as each tooth in the ratchet wheel representsinch of travel of the carriage knees.

(C) To .set out Having indexed theset works for a set-out operation,setting out is accomplished by the sawyer 'by depressing control button126 (Figure 7) This connects L1 and and energizes relay r112, therebyconnecting L1 to holding pawl cylinder valve 86 through relay 112, andholding pawl cut-off switch .128. The valve causes the cylinder 88 tooperate linkage 90, thereby pivoting pawl '60 out of engagement withratchet wheel 26 and actuating air motor and light switch 100 to connectQ5) and together, the former being connected to valve 74 of motorhingeicylinder 73 (by way of relay 130 and and to valve 94 (by way ofrelay 82 and 69), and the latter being connected to L1 through relay'112. Thus, drive roller 45 is disengaged from friction wheel 54, andset shaft 16, ratchet Wheel 26, and the setting arm assembly 28, whichis locked to said ratchet wheel, are rotated until the setting armassembly strikes post 58 (Figure 2). At this point, holding pawl cut-offswitch 128 (Figure 7) is opened by cam '13!) (Figure 3) carried by stubshaft 132 attached to the center 'oflfriction wheel 54. This actuatesvalve 86 (Figure 8),, causing holding pawl cylinder 88 (Figure 7) tomove pawl 60 into engagement 'Withthe ratchet wheel, Switch 100 is thusoperated by the linkage '90 to break the connection between and causing'valve '94 to shut 01f the air motor. This operation of the switch 100connects L1 with the 'red signallight 98 through As the setting armassembly approaches post 58, rotary cam 136 (Figure 3) carried by shaft132 'actuates restrictor valve switch 1314, thereby actuating'restrictor valve 138 (Figure 8) through L1, switch 134 and Q9. This inturn actuates restrictor cylinder 140 to reduce the air flow to the airmotor drive, thereby cushioning the impact of the setting arm assemblyagainst post 58.

After the set shaft 16 .has been stopped by engagement of the settingarm assembly with post 58 and the ratchet wheel has been locked againstmovement by the pawl 60, the set-out button 126 is released, causing thegrip block to be released from the ratchet wheel and causingthe indexingmotor 49 to drive the setting arm assembly 28 until the indexing, orlimit, switch 68 corresponding to that called for by the setting of theselector ,e.'g., .tap, switch 104 is energized by setting arm cam 71,-thereby causing the grip block to be engaged with the ratchet wheel andconditioning the control system for another "set-out operation.

Exhaust valve 142 for the air motor is operated one Way when the airmotor drive is connected to set shaft 16 and operated reversely whensaid air motor drive is cutoflF. Brake 144 (Figure 7) is applied to thefriction wheel 54 by cylinder :146 under control of valve 148 during theoccasions when the set shaft 16 is being driven forwardly or reverselyat will, i.e. when'the grip block is not engaged with the ratchet wheel.Hinge cylinder valve 74 operates to cause motor hinge cylinder 73 tomovefriction drive roller 45 out of engagement with friction wheel 26 whenvalve 94 is operated to initiate air motor drive.

From the foregoing it will be seen that the subject remote control setworks achieves the objects of the invention initially recited herein,and while a specific and preferred embodiment of said remote control setworks has been shown and described it is to be understood that saidembodiment is subject to modification within the spirit of the inventionand the scope of the appended claims.

What is claimed is:

1. In combination with set work means comprising a drive shaft andmotive power means therefor adapted to drive set shaft means for'theadvancing, receding and setout by the latter of the knee elements of asaw mill carriage, a control vshaft for said drive shaft and for saidset shaft means coupled thereto for rotation therewith, a ratchet wheelfixedly secured to said control shaft, a setting arm assembly mountedfor rotation in concentric relation to said control shaft, support meansfor the aforementioned elements, said assembly including a grip blockmounted for movement into engagement with said ratchet wheel and out ofengagement therewith, and a massive stop member rigidly mounted on saidsupport means defining the end of the path of movement of said settingarm assembly, said stop member being operable through its own fixednessand inertia, when said assembly moves into engagement with said stopmember and when said grip block is in engagement with said ratchetwheel, mechanically to stop said drive shaft and set shaft means againstfurther rotative movement: means for remotely controlling the rotativemovement and the degree thereof of said setting arm assembly includingdrive means for said setting arm assembly adapted toselectivelypositionally index the same relative to said ratchet wheel,and means responsive to the reaching by said setting arm assembly ofsuch predetermined indexing position to urge said grip block intoengagement with said ratchet wheel.

2. In combination with set work means comprising a drive shaft andmotive power means therefor adapted to drive set shaft means for theadvancing, receding and set-out by the latter of the knee elements of asaw mill carriage, a control shaft for said drive shaft and for said setshaft means coupled thereto for rotation therewith, a ratchet wheelfixedly secured to said control shaft, a setting arm assembly mountedfor rotation in concentric relation to said control shaft, said assemblyincluding a grip block mounted for movement into engagement with saidratchet wheel and out of engagement therewith, and a stop memberdefining the end of the path of movement of said setting arm and adaptedwhen said assembly moves into engagement with said stop member and whensaid grip block is in engagement with said ratchet wheel to stoprotative movement of said drive shaft and set shaft means: means forremotely controlling the rotative movement and the degree thereof ofsaid setting arm assembly comprising a motor and mounting meanstherefor, a plurality of selectively spaced first indexing, or limit,switches positioned on a set-up ring disposed concentrically to saidratchet Wheel, trip means carried by said'setting arm assembly adaptedto engage and actuate said switches as said assembly is rotated with thegrip 'block out of engagement with said ratchet wheel, a

plurality of remotely located selector switches, each associated with agiven one of said indexing switche s, and

circuit means interconnecting said indexing and selector switches, saidmotor, and means for movingsaid grip ,block into and out of engagementwith said ratchet from said ratchet wheel, said motor is then'energizedto .rotate saidlsetting arm assembly in the direction of that indexingswitch which is associated with said actuated selector switch, said tripmeans engages and actuates said associated indexing switch, causing saidmotor to be deenergized and said grip block to be moved into engagementwith said ratchet wheel.

. v 3. ,The remotecontrol set works of claim 2 including when saidset-out control switch is actuated and when associated ones of saidindexing and selector switches are actuated to energize said motivepower means and thereby said drive shaft, set shaft means and controlshaft, to set-out said knee elements until said setting, arm assembly isbrought against said stop member.

4. The remote control set works of claim 3 including a holding pawl forsaid ratchet wheel, means for engaging said pawl therewith operative inresponse to said setting arm assembly as the latter engages said stopmember, means for de-energizing said motive power means operablesubstantially simultaneously with the engagement of said pawl with saidratchet wheel, and means for disengaging said pawl from said wheeloperable substantially simultaneously with energization of said motivepower means.

5. The remote control set works of claim 4 including means operable inresponse to reverse actuation of said set-out control switch and to thecontinued actuation of said selector switch to automatically re-indexsaid setting arm assembly to condition said set works for the subsequentactuation of said set-out control'switch. 6. A Trout-type set works fora sawmill carriage comprising a control shaft operably connected todrive and set shafts, a drive motor for said shafts, a ratchet Wheelfixedly secured to said control shaft for rotation there with, a settingarm assembly including a setting grip block mounted coaxially withrespect to said control shaft for rotation therewith or rotativemovement relative thereto in accordance with whether said grip block isin engagement with or out of engagement with said ratchet wheel, anindexing motor and means operably relating the same to said setting armassembly to impart rotational movement to the latter when said gripblock is out of engagement with said ratchet wheel, at least oneindexing, or limit, switch having an actuator disposed in the path ofmovement of said assembly when the latter is moved in one direction, andelectrical control means including a remotely disposed selector switch,the actuation of which selector switch causes energization of saidindexing motor and resulting rotative movement of said assembly, andmeans responsive to actuation of said indexing, or limit, switch tode-energize said indexing motor and move said grip block into engagementwith said ratchet wheel, thereby indexing said set works.

7. The Trout-type set works of claim 6, said electrical control meansfurther including a set-out switch, the actuation'of which energizessaid drive motor and rotates said control shaft and assembly in theotherdirection, a further switch in the path of movement in said otherdirection of said setting armassembly, said latter switch being adaptedto be actuated 'by engagement of said assembly therewith to de-energizesaid drive means and to energize means for abruptly urging a pivotallymlclmlited pawl into holding engagementwith said ratchet w ee, ,7 7 -l r8. The Trout-type set works of claim7, said electrical control means;further including means responsive to deactuation of said set-outswitch and continued actuation of saidiselector switch to automaticallyre-index said set works/j M t o ;9. A Trout-type set works'for a sawmillcarnage comprisingaicontrol'shaft operably connected to drive and setshafts, a drive motor for said shafts, a ratchet wheel fixedly securedto said control shaft for rotation therewith,fa-setting' arm assembly,"including a settinggrip block movably mounted thereon, mountedcoaxially with respect to said-control; shaft for rotation therewithorrotative movement relative thereto in'accordance with whether said gripblockis in engagement with orout iof engagement'with said ratchet wheel,a stop memberjdefining the end of the path-of set-out movement of, saidsetting arm assembly and adapted when said assembly moves intoengagement with said stop member and when said grip block is inengagement with said ratchet wheel to stop rotative movement of saiddrive shaft and set shaft means, an indexing motor and means operablyrelating the same to said setting arm assembly to impart rotationalmovement to the latter when said grip-block is out of engagement withsaid ratchet wheel, doubleacting power means connected to said gripblock operable to move said block relative to said setting arm assemblyinto and out of engagement with said ratchet wheel, electricalcontrolmeans including remotely disposed selector switch meansselectively operable to-energize said indexing motor and rotate saidassembly to a predetermined indexing station, and means responsive tothe reaching by said assembly of said predetermined indexing station toactuate said double-acting power means in the direction causing movementof said grip block into engagement with said ratchet wheel. 1

10. A Trout-type set works for a sawmill carriage comprising a controlshaft operably connected to drive and set shafts, 'a drive motor forsaid shafts, a ratchet wheel'fixedly secured to said control shaft forrotation therewith, a setting arm assembly, including a setting gripblock movably mounted thereon, mounted coaxially with respect to saidcontrol shaft for rotation therewith or rotative movement relativethereto in accordance with Whether said grip block is in engagement withor out of engagement with said ratchetwheel, a stop member defining theend of the path .of set-out movement of said setting arm assembly andadapted when said assembly moves into engagement with said stop memberand when said grip block is in engagement with said ratchet wheel tostop rotative movement of said drive shaft and set shaft means, anindexing motor and means operably relating the same to said setting armassembly to impart rotational movement to the latter when said gripblock is out of engagement with said ratchet wheel, doubleacting powermeans connected to said grip block operable to move said block relativeto said setting arm assembly into and out of engagement with saidratchet wheel, a control system including first control meansselectively operable to energize said indexing motor and rotate saidassembly to a predetermined indexing station andsecond control meansoperable after the reaching by said assembly of said predeterminedindexing station to actuate said double-acting power means in thedirection causing movement of said .grip block into engagement with saidratchet wheel.

References Cited in the file of this patent UNITED STATES PATENTS793,406 Trout June 27, 1905 995,205 Trout June 13, 1911 2,175,822 BestOct; 10, 1939 2,574,393 Hult Nov.'6, 1951 2,707,501 Craik May 3, 19552,768,662 Roberts Oct. 30, 1956

